| Casad Dam | |
| Location Map: | Washington |
| Coordinates: | 47.5381°N -122.7797°W |
| Country: | United States |
| Location: | Bremerton, Washington |
| Purpose: | Municipal water supply[1] |
| Status: | O |
| Construction Began: | 1955 |
| Opening: | 1957 |
| Cost: | $1.4 million |
| Owner: | City of Bremerton |
| Dam Type: | Concrete arch |
| Dam Height: | 190feet |
| Dam Length: | 416feet |
| Dam Elevation Crest: | 643.7feet |
| Dam Width Base: | 56feet |
| Res Name: | Union River Reservoir |
| Res Capacity Total: | 1400000000usgal |
| Res Catchment: | 3000acres |
| Res Surface: | 40acres |
| Res Elevation: | 607feet |
| Extra: | Coordinates from USGS, specifications from factsheet unless noted |
Casad Dam is a concrete arch dam in Bremerton, Kitsap County, Washington), built starting in 1955 and completed in 1957.
The dam is Kitsap County's only major water diversion structure, impounding Union River to form a reservoir that is the source of over half of Bremerton's municipal water supply. The water is gravity fed from the reservoir at in the hills to the city, most of which is at or near sea level.
Bremerton owns 95% of the land in its 3000acres watershed, and the Union River reservoir behind Casad Dam holds 1400000000usgal of water. The city is unusual in drawing most of its water supply from an open air source, the reservoir, which can occasionally be affected by algal blooms.
The dam's intake tower underwent seismic retrofit in 2012 to withstand a 0.78 g peak acceleration in a maximum credible earthquake from the Seattle Fault which runs about four miles (7 km) away, on the north side of Green Mountain.